Support ignorance of base class finalizers.

tools/clang/blink_gc_plugin/tests/class_requires_finalization_base.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CLASS_REQUIRES_FINALIZATION_BASE_H_
 #define CLASS_REQUIRES_FINALIZATION_BASE_H_
 
 #include "heap/stubs.h"
 
 namespace WebCore {
 
 class A : public GarbageCollected<A> {
 public:
     virtual void trace(Visitor*) {}
 };
 
 class B {
 public:
     ~B() { /* user-declared, thus, non-trivial */ }
 };
 
+// WebCore::ScriptWrappable receives special treatment
+// so as to allow it to be used together with GarbageCollected<T>,
+// even when its user-declared destructor is provided.
+// As it is with Oilpan disabled.
+class ScriptWrappable {

[zerny-chromium, 2014/07/08 07:45:03]

Define ScriptWrappable in heap/stubs.h

That should avoid some of the line:column changes and make it easier to simply
remove the ScriptWrappable destructor when we remove the ignore code again.

[sof, 2014/07/08 08:47:05]

Done.

+public:
+    ~ScriptWrappable() { /* user-declared, thus, non-trivial */ }
+};
+
 // Second base class needs finalization.
 class NeedsFinalizer : public A, public B {
 public:
     void trace(Visitor*);
 };
 
 // Base does not need finalization.
 class DoesNotNeedFinalizer : public A {
 public:
     void trace(Visitor*);
 };
 
+class GCedClassWithAScriptWrappableBase
+    : public A, public ScriptWrappable {
+public:
+    void trace(Visitor*);
+};
+
+class GCedClassWithAScriptWrappableAndAFinalizableBase
+    : public GCedClassWithAScriptWrappableBase
+    , public B
+    , public ScriptWrappable {
+public:
+    void trace(Visitor*);
+};
+
 }
 
 #endif